Flue liner



Aug. 30, 1938.

A. KAUFFMANN,

FLUE LINER Filed June 8, 1936 Twwm M1 A Patented Aug. 30, 1938 UNITED STATES PATENT oFFmE 2 Claims.

This invention has reference to the art of making flue linings and has for its object to provide lining members having means for interlocking one member upon another and in connection with this feature, means for permitting insertion of cement in the joint between the interlocking portions, there being special means for anchoring the cement in the joint.

The foregoing and other features will become clearly apparent during consideration of the following description when read in connection with the accompanying drawing in which;

Fig. 1 is an elevational sectional view showing several units of my invention assembled to form a lining for a flue;

Fig. 2 is a perspective view of a unit of the lining with a portion cut away to show details of construction; and

Fig. 3 is an elevational sectional view showing details of construction to be referred to.

In carrying out my invention I provide tile members it such as that shown in Fig, 2.

In the drawing, the tile is shown as having a rectangular form, but it will be understood that the principle of construction may be applied to tiles having other forms, such as round, hexagonal or any other form suitable for the purpose.

At its upper edge the tile is fashioned to have an upstanding portion I I surrounding the interior opening. The inner surface of portion I I is continuous with the inner surface of the tile, while its outer surface is set back from the outer surface of the tile, thus forming a shoulder I Z.

The upper face of the shoulder is made to slant downwardly and inwardly toward the outer surface of portion I I thus forming a groove I3.

At its lower edge the inner surface of the tile is cut back to form a shoulder M as shown in Fig. 3 and the cut back portion is so dimensioned as to fit over the portion I I of an identical tile.

The longitudinal dimension of portion I I .is greater than that of the cut back portion at the lower end so that when the tiles are assembled, a space is left between shoulder I2 of the lower tile and the lower edge of the adjoining tile as shown in Fig. 1.

In this arrangement the space noted obviously provides a place adapted to receive cement whereby the joint is sealed, with the groove I 3 providing an anchorage for the cement.

It is to be noted that with my principle of interlocking and sealing, no cement is placed where it can enter the interior of the flue to form rough projections to catch soot and the like, or loosen and fall into the flue.

Further, the cement, once hardened in the joint, is locked in place and cannot fall out of the joint even though it may become cracked and out of bond with the tile. Thus a tight sealed joint is assured. 5

When assembled, the upper surfaces of portions II lie in direct contact with the shoulders I I of the tile above so that the weight of the stack is supported at the joints by direct bearing. There being no cement or mortar between the surfaces, the stack cannot be weakened by loosening and falling out of the cement or mortar as is usual with stacks set up in the ordinary way.

It will be seen that with the tiles set as above described, the interior surface of the stack is substantially continuous and free from projections or roughness which promote accumulation of soot or tar on the walls of the flue. It will further be apparent that the outside surface is continuous and smooth to facilitate the application of a covering.

In Fig. 1 I show fragmentally a brick covering I5 which may be built around the stack. This is to illustrate an obvious means of building my lining tiles into a chimney. Other covering means will be obvious to those skilled in the art. The invention is complete without a cover.

The foregoing has described my invention. Modifications of structure are obviously possible without alteration of the principle involved. I do 30 not wish to be limited in structure or function except within the scope of the appended claims.

What I claim is:

1. In a chimney, a flue lining comprising a series of superposed hollow tiles, each of the latter being equipped along its lower end with an internal peripheral cutaway portion and at its upper end with an external peripheral cutaway portion of greater length than and adapted to be received telescopically within the lower cutaway portion of 40 the next higher tile, with its upper extremity abutting the upper wall of the cutaway portion of the higher tile, there being a peripheral groove in the lower wall of the upper cutaway portion of each tile opposed to and spaced from the opposed 45 lower edge of the next upper tile and affording a cement receiving peripheral aperture possessing greater depth inwardly of than at its mouth.

2. In a chimney, a flue lining including a series of hollow tiles equipped with telescopically interengaged end portions having peripheral walls of appreciably less thickness than the remaining portions of said tiles, said interengaged portions including an internal peripheral stop shoulder on the upper of each of two superposed tiles against which the upper extremity of the tower of said tiles abuts, the lower of said tiles equipped with a peripheral shoulder opposed to and spaced from the lower extremity of the upper tile and having a peripheral groove therein extending from the outer edge of said shoulder and increasing in depth as it approaches the thin wall of said lower tile, thereby presenting a cement receiving peripheral pocket between each lower and next upper tile having an open peripheral mouth and of increasingly greater cross-sectional dimensions inwardly of than at said mouth.

AARON KAUFFMANN. 

